BAKE for 25 to 30 minutes or until wooden pick inserted in center comes out clean. Cool in pans on wire racks for 10 minutes; remove to wire racks to cool completely. Frost with Creamy Peanut Butter Milk Chocolate Frosting.

FOR CREAMY PEANUT BUTTER MILK CHOCOLATE FROSTING:MICROWAVE remaining morsels in small, uncovered, microwave-safe bowl on MEDIUM-HIGH (70%) power for 1 minute; STIR. Morsels may retain some of their original shape. If necessary, microwave at additional 10 to 15-second intervals, stirring just until morsels are melted. Beat cream cheese, melted morsels, vanilla extract and salt in small mixer bowl until light and fluffy. Gradually beat in powdered sugar.